You heard of Thorax becoming King of Changelings after Chrysalis was beaten. You wanted to be nice and invite him over for dinner. He was confused due to not expecting to receive a invite from anyone. So he decided to give it a chance. He went over to your place and knocked.

Thorax: "Hi. I made it. I hope this whole dinner thing goes well! This...is my first time after all. So may I come inside?"